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Singh, M. (author), Datta, K. (author), Amarnath, A. (author), Wagner, F. (author), Zhao, Y. (author), Yang, G. (author), Bracesco, A. (author), Phung, N. (author), Zhang, D. (author), Zardetto, V. (author), Najafi, M. (author), Veenstra, S.C. (author), Coletti, G. (author), Mazzarella, L. (author), Creatore, M. (author), Wienk, M.M. (author), Janssen, R.A.J. (author), Weeber, A.W. (author), Zeman, M. (author), Isabella, O. (author)Single junction crystalline silicon (c-Si) solar cells are reaching their practical efficiency limit whereas perovskite/c-Si tandem solar cells have achieved efficiencies above the theoretical limit of single junction c-Si solar cells. Next to low-thermal budget silicon heterojunction architecture, high-thermal budget carrier-selective...article 2023
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Najafi M., (author), Theelen, M. (author), Fledderus, H. (author), Zhang, D. (author), Zardetto, V. (author), van Aken, B. (author), Veenstra, S. (author)Semitransparent perovskite solar cells (ST-PSCs) are very attractive due to their potential applications in single junctions for building-integrated photovoltaics (BIPV) and in tandem PV technology using low-bandgap bottom solar cells. Despite the high efficiency achieved, the ST-PSCs still suffer low bifaciality, which can limit their overall...article 2022
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Hernández-Balaguera, E. (author), Munoz-Díaz, L. (author), Pereyra, C. (author), Lira-Cantu, M. (author), Najafi, M. (author), Galagan, Y. (author)The unprecedented increase of photovoltaic perovskites performance metrics has been obscured by the puzzling phenomenology underlying the device's anomalous ionic/electronic landscape. Thus, the establishment of a reliable measurement protocol of efficiency measurements, unanimously adopted by the perovskite's community, is indeed necessary to...article 2022
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Hernández-Balaguera, E. (author), Romero, B. (author), Najafi, M. (author), Galagan, Y. (author)Interface engineering has become one of the most important research strategies to harness the full potential of perovskite solar cells. Photovoltaic community seems to herald the imminent development of 30% efficient perovskite devices with competitive lifetimes, subject, among other aspects, to clarify “what happens under the interfaces.” One...article 2022
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Bakker, K. (author), Sala, J. (author), Najafi, M. (author), Daenen, M. (author), Geerligs, B. (author)During partial shading of a monolithically interconnected cell string, the shaded cells can operate at a reversed voltage. This negative voltage can lead to degradation of the shaded cell. For a successful practical application of large area Perovskite modules (e.g. in four terminal tandems) a shade tolerant top module is required. In this study...conference paper 2022
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Manshanden, P. (author), Coletti, G. (author), Rosca, V. (author), Jansen, M.J. (author), de Groot, K.M. (author), de Graaff, G.J. (author), Simurka, L. (author), Najafi, M. (author), Zardetto, V. (author), Dogan, I. (author), Fledderus, H. (author), Veenstra, S.C. (author), Creatore, M. (author)In order to further reduce the LCOE of PV, the conversion efficiency must increase beyond the practical limit of silicon technology (26% [1]). It is believed that tandem module technology, combining bottom c-Si cells with low-cost thin-film top cells, can overcome the silicon limit. Recently, bifacial glass/glass modules are gaining market share...conference paper 2021
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Geerligs, L.J. (author), Manshanden, P. (author), Hoek, E.G. (author), Okel, L.A.G. (author), Dogan, I. (author), Simurka, I. (author), Fledderus, H. (author), Zardetto, V. (author), Zhang, D. (author), Najafi, M. (author), Bracesco, A.E.A. (author), Creatore, M. (author), Coletti, G.C. (author), Veenstra, S.C. (author)—4-terminal tandem technology is a straightforward approach to bring to the market perovskite/crystalline silicon tandem modules. However, dealing with 4 terminals poses a challenge at system level for practical deployment. We have produced large area 4-terminal perovskite/crystalline silicon tandem modules for a study of the performance of a 2...conference paper 2021
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Smirnov, Y. (author), Schmengler, L. (author), Kuik, R. (author), Repecaud, P.A. (author), Najafi, M. (author), Zhang, D. (author), Theelen, M. (author), Aydin, E. (author), Veenstra, S. (author), de Wolf, S. (author), Morales-Masis, M. (author)Sputtered transparent conducting oxides (TCOs) are widely accepted transparent electrodes for several types of high-efficiency solar cells. However, the different sputtering yield of atoms makes stoichiometric transfer of target material challenging for multi-compounds. Additionally, the high kinetic energies of the arriving species may damage...article 2021
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López-González, M.C. (author), Del Pozo, G. (author), Martín-Martín, D. (author), Muñoz-Díaz, L. (author), Pérez-Martínez, J.C. (author), Hernández-Balaguera, E. (author), Arredondo, B. (author), Galagan, Y. (author), Najafi, M. (author), Romero B., (author)Perovskite solar cells (PSCs) have become very popular due to the high efficiencies achieved. Nevertheless, one of the main challenges for their commercialization is to solve their instability issues. A thorough understanding of the processes taking place in the device is key for the development of this technology. Herein, J-V measurements have...article 2021
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Hernández-Balaguera, E. (author), Romero, B. (author), Arredondo, B. (author), del Pozo, G. (author), Najafi, M. (author), Galagan, Y. (author)The potential opportunities of perovskite-based technology to further advance in the photovoltaic field and implement an extensive industrial application, will mainly depend on whether some of its weaknesses, such as current density-voltage (J−V) hysteresis, can be overcome. In this sense, a critical aspect is the understanding and the...article 2020
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Glowienka, D. (author), Zhang, D. (author), Najafi, M. (author), Giacomo, F.D. (author), Szmytkowski, J. (author), Galagan, Y. (author)To achieve the highest performance using perovskite solar cells it is necessary to understand all the dominant mechanisms which affect the operation of solar cell. Here, we have investigated the bulk and interface trap-assisted recombination processes in the solar cells with p-i-n architecture. These studies are based on the numerical and...conference paper 2020
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Glowienka, D. (author), Di Giacomo, F. (author), Najafi, M. (author), Dogan, I. (author), Mameli, A. (author), Colberts, F.J.M. (author), Szmytkowski, J. (author), Galagan, Y. (author)Recent research has shown that perovskite solar cells with a mixed dual A-cation have much better structural stability without loss of efficiency than single cation devices. Mixed cation perovskites create a lot of questions about the salts being used for the formation of the best-quality layer. Here, we have investigated three sources of...article 2020
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Coletti, G. (author), Luxembourg, S.L. (author), Geerligs, L.J. (author), Rosca, V. (author), Burgers, A.R. (author), Wu, Y. (author), Okel, L. (author), Kloos, M. (author), Danzl, F.J.K. (author), Najafi, M. (author), Zhang, D. (author), Dogan, I. (author), Zardetto, V. (author), Di Giacomo, F. (author), Kroon, J. (author), Aernouts, T. (author), Hüpkes, J. (author), Burgess, C.H. (author), Creatore, M. (author), Andriessen, R. (author), Veenstra, S. (author)Ten years after the first paper on the properties of metal halide perovskite solar cells, their efficiency and stability have increased tremendously. It was quickly realized that their application goes beyond the single-junction use. Indeed, perovskite cell technology, by virtue of its tunable bandgap and low sub-bandgap absorption, offers new...article 2020
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López-Fraguas, E. (author), Arredondo, B. (author), Vega-Colado, C. (author), Pozo, G.D. (author), Najafi, M. (author), Martín-Martín, D. (author), Galagan, Y. (author), Sánchez-Pena, J.M. (author), Vergaz, R. (author), Romero, B. (author)The past few years have seen a great increase in the development of Visible Light Communication systems (VLC), mainly triggered by the wide variety of situations they can be used in. These communication systems have traditionally employed inorganic light emitters and photodetectors. In this work, we present a VLC system using an organic emitter...article 2019
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Glowienka, D. (author), Zhang, D. (author), di Giacomo, F. (author), Najafi, M. (author), Veenstra, S. (author), Szmytkowski, J. (author), Galagan, Y. (author)In order to achieve the highest performance of organometal trihalide perovskite solar cells, it is required to recognize the dominant mechanisms which play a key role in a perovskite material. In the following studies, we have focused on the interfacial recombination between the hole transporting layer (HTL) and the perovskite CH3NH3PbI3 in...article 2019
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Romero, B. (author), del Pozo, G. (author), Arredondo, B. (author), Martin-Martin, D. (author), Hernandez-Balaguera, E. (author), Najafi, M. (author), Galagan, Y. (author)Perovskite Solar Cells (PSC) have attracted great attention due to the high efficiencies achieved in the past few years (up to 24.2 %). Perovskite semiconductors show excellent light absorption and large charge-carrier mobilities. In addition, device fabrication is low cost and easily up-scalable. However, the current density-voltage curve (J-V)...conference paper 2019
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Najafi, M. (author), Zhang, D. (author), Zardetto, V. (author), Lifka, H. (author), Verhees, W. (author), 't Mannetje, H. (author), Fledderus, H. (author), Di Giacomo, F. (author), Hupkes, J. (author), Poodt, P. (author), Galagann, Y. (author), Luxembourg, S. (author), Coletti, G. (author), Geerligs, B. (author), Linden, H. (author), Veenstra, S. (author), Andriessen, R. (author)In this work, efficient rigid and flexible semi-transparent perovskite solar cells (ST-PSCs) were prepared in inverted (light incidence through hole transport layer) configuration. All layers were deposited by a combination of low-temperature solution-based, sputtering and spatial atomic layer deposition (sALD) techniques, which can be...conference paper 2019
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Zardetto, V. (author), Galagan, Y. (author), Creatore, M. (author), Coletti, G. (author), Poodt, P. (author), Veenstra, S. (author), Andriessen, R. (author), di Giacomo, F. (author), Zhang, D. (author), Burgess, C. (author), Verhees, W. (author), Fledderus, H. (author), Dogan, I. (author), Najafi, M. (author), Lifka, H. (author)In order to commercialize the perovskite solar cells (PSC) technology, efficient and industrial deposition methods over large areas have to be adopted, and the device architectures have to provide long term stability. In this work we combine several upscalable deposition methods to develop a stable semitransparent PSC. The control of the...conference paper 2019
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Zhang, D. (author), Najafi, M. (author), Zardetto, V. (author), Dorenkamper, M. (author), Verhees, W. (author), Zhou, X. (author), Senes, A. (author), Gutjahr, A. (author), Romijn, I. (author), Veenstra, S. (author), Geerligs, B. (author), Creatore, M. (author), Aernouts, T. (author), Andriessen, R. (author)In this contribution the development of highefficiency planar semi-transparent perovskite solar cells (STPSCs) for tandem applications is presented. The ST-PSC absorber layer, and electron and hole transport layers were processed using spin coating. The near-infrared (NIR) transmission of the ST-PSC is optimized by improving ITO material quality...conference paper 2018
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Najafi, M. (author), Zhang, D. (author), Zardetto, V. (author), Di Giacomo, F. (author), Jaysankar, M. (author), Coletti, G. (author), Dorenkamper, M.S. (author), Lifka, H. (author), Verhees, W.J.H. (author), Poodt, P. (author), Geerligs, L.J. (author), Aernouts, T. (author), Veenstra, S. (author), Andriessen, H.A.J.M. (author)The purpose of the work is to investigate high-efficient and stable 4-terminal perovskite/c-Si tandem devices. Hybrid tandems of c-Si bottom cells and perovskite top cells are perhaps the most promising candidates to reduce the levelized cost of electricity by increasing the overall tandem cell efficiency. To turn this promise in a commercial...conference paper 2018
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